Across Florida · Vetted local pros
What does it mean when one spot on my floor feels warm?
A straight answer first, then what you can safely check yourself and when to get a pro. Free estimates from a vetted MB pro near you.
A single warm spot on the floor most often means a hot water line is leaking under the slab, and the heat is rising through the concrete. It can also be harmless, such as sun through a window, a heat source below, or a duct or appliance nearby, so a few quick checks will tell you which one you have.
The deciding factor is whether the spot stays warm at 2 a.m. with the sun down and nothing running. A spot that stays warm, especially with a higher water bill or the sound of running water, deserves a pro's attention soon.
Why a floor spot gets warm
Many Florida homes are built on a concrete slab, with some water lines running in or under it. When a hot water line develops a pinhole or crack, hot water escapes into the soil or slab and warms the floor above it. Corrosion, shifting ground and aging pipe such as polybutylene are among the things that can cause it.
Other causes are less serious. Afternoon sun can warm tile or concrete near a window or sliding door. Ductwork in or near the slab, a water heater against a wall, or a large appliance can also leave one area warmer than the rest. The difference is that these warm spots change with the time of day or when the equipment runs, while a leak does not.
What you can check yourself
Read the water meter
Turn off every tap and appliance that uses water, then look at the meter. If the leak indicator or dial keeps moving, water is escaping somewhere.
Watch the timing
Feel the spot in the morning, midday and at night. A spot that follows the sun is probably not a leak, but one that stays warm after dark is a concern.
Listen and look
Stand quietly near the spot with the house silent and listen for hissing or trickling. Look for damp grout, a musty smell, lifting flooring, or baseboards that look swollen or stained.
Check the hot water
Notice whether the water heater seems to run often, or hot water takes longer to arrive than it used to. Compare your last few water bills for an unexplained rise.
Shut off the water if needed
If you see pooling water or the meter races, closing the main water shutoff valve is a reasonable step while you wait for a pro. Do not cut into the floor or dig to find the pipe.
When to stop and call a pro
Call a pro if the spot stays warm at night, the meter moves with everything off, you hear running water, or you see dampness, mildew or lifting floors. If water is near outlets, appliances or the electrical panel, stay clear and let a pro assess it. Leaks under a slab will not fix themselves, and the water can undermine flooring and encourage mold in Florida's humidity.
Florida requires plumbing work to be done by a licensed plumbing contractor under chapter 489, Florida Statutes. A building or roofing license does not cover plumbing. You can verify any license number on the Florida DBPR website. Re-piping typically needs a plumbing permit from the city or county, which the plumbing contractor pulls, while a small repair usually does not.
MB matches homeowners with a pro for plumbing in Miami-Dade, Broward and Palm Beach counties only. Call (954) 707-6550 or use the form for a free estimate, and we match you with a vetted pro near you and book the visit.
Your MB pro handles the permit when the job needs one. You can look up a contractor's license at Florida DBPR.
What your MB pro will do
- Confirm the causeYour MB pro will pressure-test the lines and use leak detection equipment to tell whether the warm spot is a slab leak or something else, without breaking up the floor to guess.
- Pinpoint the leakOnce a leak is confirmed, the pro locates it along the line so any opening in the floor is as small as the repair allows.
- Lay out the optionsDepending on the pipe's age and condition, the choices may include repairing the section, rerouting the line, or re-piping. Ask which option the pro recommends and why.
- Handle the permitIf the work needs a permit, such as a re-pipe, the contractor pulls it and schedules any inspection.
How it works
Step 1
Tell us what you need
Call or send the short form with your city and the job. Estimates are free.
Step 2
We match you with a vetted pro near you
We pick a vetted pro from our network who works in your part of Florida and book the visit.
Step 3
Your pro gives a free estimate and does the work
Your MB pro looks at the job and gives you a free estimate. You decide whether to go ahead — and we stay your point of contact.
Related questions
- Can a warm floor spot be something other than a leak?
- Yes. Sun through glass, a nearby water heater, ductwork or a large appliance can warm one area. If the spot cools down when the sun moves or the equipment shuts off, it is likely not a leak, but the water meter test is still worth doing.
- Is a slab leak an emergency?
- It is urgent but usually not dangerous by itself. Closing the main water valve limits the water loss, and then you can arrange a pro to confirm and repair it. Treat any water near electrical items more cautiously and stay away from them.
- What affects the cost of fixing a slab leak?
- The main factors are how deep and accessible the line is, the type and age of the pipe, how much flooring must be opened up, whether a section repair or full re-pipe makes sense, and whether a permit is needed. A free estimate from your MB pro explains these once the leak is located.
- Will insurance or my HOA be involved?
- Possibly. Policies and association rules differ, so check yours, and keep your pro's leak-detection findings and photos, which can help with a claim. Condo owners should also confirm which pipes are the owner's responsibility.
Request a free plumbing estimate
Tell us what's going on. We'll match you with a vetted pro near you.
- 1Tell us what you need.
- 2We match you with a vetted pro near you.
- 3Your pro gives a free estimate and does the work.
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(954) 707-6550